Solar Powered UPS Systems

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Solar Powered UPS Systems

Sangam Kumar Singh1, Rohit Madhuraj2, Rohit Kumar Kamat3, Ved Prakash Arya4, Vishal Kumar5

Shyamal Kumar Roy6

4th Year, Department of Electrical Engineering, Guru Nanak Institute of Technology, Sodepur, Kolkata, India1

Assistant Professor, Department of Electrical Engineering, Guru Nanak Institute of Technology, Sodepur,

Kolkata, India6

ABSTRACT: This paper provides the research and development of a solar powered UPS in India’s market as an alternative source of energy. It consists of design which is done according to our research. The design of solar UPS consists of solar charge controller, inverter circuit and a solar panel. During this process many circuit simulation were done to fit the requirement of this project. It also shows that solar Ups can be highly efficient and successful in electrical UPS market. This project consists of solar panel which consist solar cell which convert solar energy into electrical energy. We also have charging circuit which will charge 12V DC (direct current) battery given in fig:-2 and inverter circuit have given in fig:-3 & fig:-5 will convert it AC (alternative current).

KEYWORDS: On-grid, Off-Grid, UPS, Solar Charge Controller, Renewable Energy

I. INTRODUCTION

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II. ADVANTAGEOFSOLARPOWER

The main advantage of using solar power energy is it’s a renewable energy and viable for long term, the maximum efficiency of solar power can be attain by proper orientation within right location. The actual beauty of solar powered supply lies in its ability to capture light energy and generate electrical energy, that can be used both as online energy source (on-grid) in case of power failure and also as Independent/alternate energy source (off-grid). There is no pollution in atmosphere due to nitrogen oxide, carbon dioxide or any other pollutants. It is an unlimited source of power which is free, unlike deleterious fossil fuels which are expensive as well.

III. SOLAR UPS SOLUTION

India still faces unprecedented energy crisis in rural and suburban area. The problems become more severe during summers. However, winter in no different as there was still an average power outage of 3-4 hours every day. Those without generators and UPS faced tremendous problems in these outages. The prices of both continued to increase due to a sharp increase in their demand. We are not using solar UPS as there replacement but it can be used as backup energy during grid failure.It also does no harm to environment. The sun shines bright throughout the year. Global solar Radiation estimates have been made for most parts of the world, and also for major cities of India which is essential for the optimum design of solar energy conversion systems. We can make use of this inexhaustible resource and contribute towards meeting the shortfall of electricity. The global formula to estimate the electricity generated in output of a photovoltaic system is: -

PR

H

r

A

E





E =Energy (kWh)

A = Total solar panel Area (m2)

r = solar panel yield or efficiency (%)

H = Annual average solar radiation on tilted panels (shadings not included)

PR = Performance ratio, coefficient for losses (range between 0.5 and 0.9, default value = 0.75)

IV. SYSTEMDESIGN

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BLOCK

DIAGRAM:-Figure 1 Block diagram of solar UPS.

SOLAR CHARGE CONTROLLER:-

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The major function of Solar charge controller:-

 Low voltage Protection

 Over voltage protection

 Battery cut-off circuit

 Back current protection

 Over charge protection

Here N Channel MOSFET Q1 is in forward biased condition in order to stop flow of current to the battery from solar panel. When sun rises and solar panel voltage reaches 10 V then this 10 V make Zener diode start conducting and thus turn on .The MOSFET Q2 which ultimately turn on the relay U1.This is known as low voltage protection. When panel voltage reaches 15 V then Zener diode reaches its conduction state and transistor Q4 reaches its saturated state and negative (-) voltage flows through it and thus turn off the MOSFET Q2.This is known as over voltage protection. If the battery is not fully charged then most of the current flow through the battery but when battery charging is full then less current flow through it, which turn off the MOSFET Q3 which ultimately turn off the 2nd relay U2.This is known as over charge protection.

INVERTER CIRCUIT DIAGRAM

Figure 3 simple inverter circuit diagram

AC can’t be stored for future use but DC can be stored for future use in a battery. The stored DC can be converted back to AC by using power inverters.

Working of DC to AC Inverter

 Solar charge controller is used to charge 12V DC battery.

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 The MOSFETs IRFZ44 are directly driven by the Q and Q’ output of CD4047.

 The MOSFETs are connected in Push Pull configuration (Power amplifier). The MOSFETs will switch according to the pulse from CD4047 astable multivibrator.

 Thus an AC voltage from output is transferred to the primary of transformer; it is stepped up to 230V.

 The transformer used here is an ordinary step down transformer which is connected in inverted manner. That is, the primary of a 230V to 12V-0-12V step down transformer can be treated as secondary for this Solar ups project.

 If you would like to get 110V AC, choose 110V to 12V-0-12V step down transformer in reversed way.

 The inverter output is filtered by capacitor C2.

 Use suitable heat sinks for MOSFETs.

Figure 4 square wave

SOLAR INVERTER ADVANTAGE

After knowing in detail what a solar inverter is and how different useful it is to make appliances work at residential and industrial levels we must discuss about the many advantages of the device.

 Solar energy is a renewable energy which helps in reducing global warming and greenhouse effect.

 Solar energy helps in saving money as many people have started using solar based devices.

 A solar inverter is really convenient for those people who use limited amount of energy.

 There is this synchronous solar inverter which helps both small homeowners and power companies as they are large in size

 There is this multifunction solar inverter which is the best among all and works efficiently. It converts the DC power to AC very carefully which is perfect for commercial establishments

 This inverter is effective in cost i.e. less expensive than generators

 Apart from solar inverters there are other devices too that make use of solar energy namely, solar cooker, solar heater.

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SOLAR INVERTER DISADVANTAGE

 Initially you need good amount of money for buying a solar inverter.

 Its efficiency is totally dependent on amount of strong sunlight.

 The solar panels that are used to attract Sunlight requires lots of space as it depend on amount of sunlight.

 Solar Inverters can work at no sun but it require fully charged battery.

V. EXPERIMANTAL RESULTS

As a whole world is facing problem of global warming and energy crisis, our project will help to reduce these problem by using solar energy to generate electricity. Solar energy is an infinite source of energy. Main Moto of our project is to promote use of renewable energy source. This project is most useful in our life because in this project one time investment fixed on life time.

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Figure 6:-square wave in oscilloscope.

Figure 7:-final solar based UPS.

VI. CONCLUSION

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REFERENCES

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[8] Wikipedia.com/solar energy.

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